separate NFS and download image hosts via DHCP?

[Robert P. J. Day]

   not clear from the man page, but is there a way to configure 
/etc/dhcpd.conf to have separate hosts for both the NFS-mountable root 
filesystem, and the downloadable boot image?

   more generally, just how thoroughly can you segregate

1) the host providing DHCP service
2) the host providing the boot image
3) the host providing the NFS-mountable root FS?

rday